Abstract
It is well known that random‐incidence absorption coefficients suffer from measurement uncertainties. Whether or not these uncertainties affect the quality of results from room acoustic prediction models depends on the specific case. One might argue that the absorption of the most relevant material must be known accurately. This, however, could be the material with highest absorption or the material with the largest surface area. In this presentation, the true random‐incidence absorption coefficient and measurement uncertainties related to the current ISO 354 are briefly discussed. Then, in order to get a better view on the consequences of those uncertainties, quantitative uncertainties of some predicted parameters such as reverberation time, strength, and clarity are calculated by using an error propagation. Effects of uncertainties of absorption coefficients distributed in various room configurations are presented and discussed.
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